Rotary underreamer.



vROTARY UNDERRBAMER. APPLIOAT'ION FILM) SEPT. 2.8.1912.'

` Ptnd Jan. 7,1913..

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A .LISNOW & A.` M, KIDD. K ROTARYVUNDERREAMBR. 'MPLIQATION FILED SEPT'. 2s; 1912.

. Patented Jan.7,1913.

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allege/gelle WITNESS ES:

' Tooltip/tom itimoy concern man? www OFFICE f v ALBERT J'. SNOW AND ARCHIE M. KIDD, 0FA TAFT, CALIFORNIA.

normar UNDERREAMER.

Be it' vknown that we, ALBERT J, SN'Wl p and Argonne M. KIDn,-citizens of theUnit/ed is a specification.

States,res'idingat Taft, in 'the county of Kern and 'State of California, have invented 'newan'd useful Improvements in VRotary 'Underreamers, of which'the following Th1s invention relates to a. rotary underreamer.k f

. `The object of the present invention" is to construct Ia simple, substantial, and re- .liable rotary underreamer, provided with.

' plping.

Another object of the invention is to pro-fr vide a series of fluidconducting passages, so positioned as to deliver fluid at or near the Acutting edges, thereby greatlyincreasing the cutting power of the reamer by continuf ously removing the cuttings and helping to remove the formation while the reamer `1s at work. j y The invention consist-s of certain novel constructions, combinations and arrangement of parts, all of 'which will be more particularly described in the following specification and drawings,- in which- Figure 1 isa section of the pipe line showing the reafier in clittingvposition. Fig. 2 is a longitudinal', vertical section ofthe reaming tool, showing itin the position where itis being extracted from the pipe'. Fig. 3 is asimilar section, showing the reaming bits in position before the reamer is inserted into the pipe line. Fig. 4 is a perspective View of the forked mandrel. Fig. 5 is a side elevation partly in section of the reamer, showing the fluidr conducty ing passages and slots throughA which the tion of the reamen Fig.

reaming tools project. Fig. 6 is a cross sec. 7 is a plan view of the reaming tool. l y There a string of pipe hasbeenlanded and it is 'necessary to have a larger hole below than the inside diameter of the pipe passed through, or -where it is desired to carry a string of pipe'to a greater depth, it

is necessary to have -a larger hole than thev outside o'f the pipe in order to give fxclearance and overcome friction.` With th1s ob- 'jectin' view we have constructed a rotary -mounted a pair of reamin Y .bl

` ferent styles of cutting edges.

l -I Specication of Letters Patent. Patented Jan. 7, 1913. n. Application fled' Sept'ember 28,'1912. Serial No. 722,871.

underreamer consisting of a main body A secured to the 'end of a -hollow drill rod B by any -suitable means, as a coupling 2. The lower end of the main, body portion of the 'reamenis provided with a 4drill collar 3,

in which is secured a bit 4, of any suitable description, dependingupon' the nature of s the formation through which the bit is passf ing. This is provided for the purpose ofV drillinga new hole v'or for the purpose of cleaning out cavings or other materialbelow the reamer whilereaming, Slidabl-y mounted within the main reamer 'body A. is a forked mandrel, 5, in which is pivotally 6 6 which extend a suita distance out- .side of the reamerbody through slots 7 and tools or bit-s .i

7 formed in the reamei; body. The reamer bits 6 and v6- are held in position b a pin 8, passing through the forked man rel hand exert its pressure against the bottom por.

tion of the forked mandrelywhich is provided with a central hub o r extension 11 around which the spring, is seated. The` pressure of n the spring normally tends to force the forked mandrel against. the upper end of the chamber 12 in which itis mounted for the purpose yof throwing the'reaming bits into cutting position, as shown at 13,

,Figa 1. i The inner ends ofjt'he reaming bits are provided with rounded shoulder portions 14,

which normally contact with the walls `of the upper portions of the slotsl 7 andV 7, These Will'cause the reaming vtools to be thrown into cutting position when the forked mandrel is moved into its upperpo-` sition. The shape of these cutters may be .changed or improvedI from 'time to time as the location and conditions may demand, as the different formations may require vdif- Theymay be square edged, bevele round, toothed, or they` may be longer or shorter, according to the diameter of the hole required. l V

' When it is desired to`drop kthe rea-mer through the piping into the cutting position shownin Fig. v1-, "il:x(l is necessary to temporarily withdraw the reaming' bits for the pur- .or rod by hydraulic force, and when proholes being positioned, as shownv in this. reamer, arel so arranged that the Huid will .provided a series of iuid conducting chan-A pose of 'giving thenecessarv clearance when,

dropping the tool through th'epiping. ,j

is accomplished by screwing 'ka-neye-bolt`r 15'" into the cylindrical extensiony 11;` formed on the lower end of the mandrel;` this 'being provided with a threaded hole 16..for this urpose. The eye-bolt is then pulled in the/ irection of arrow Z), causing the mandrel' to lbe drawn into the lower position showi'itff in Fig. 3 against the pressure of thegctnl;l

spring l0. A wire or anyother suitaliglefas-v tening 17 is then tied around theoutsidevof the reamer, as shown in Fig. 3, forl the pui pose of holding the reaming cuttersin thel contracted position. The eye-bolt is removed and the tool dropped into cutting position and rotated; a few revolutions of" the reamer causing the wire or other material used to secure the cutters to break -as the exposed portions of the cutters come in coni In operating a reamer of the constructionv here shown, it is very desirable to force fluid under varied pressuresgas from fifty to two hundred and fifty or more pounds to the square inch, depending lupon the depth of the hole and the nature of the material being undercut, for the purpose of removingthe cuttings of the reaming tools and. also for the purpose of removing cavings or other material.- With this object in view, we have nels 18, 19 and 20. The' passage 18'connects at one en d 21 with the hollow portion ofthe drill rod, through which the fluidl under pressure is conducted, and at the other end' with the hollow portion 9 in the drill collar. The drill bit 4, garried by the drill collar, may be provided with a suitable assage, as 22, for the purpose of conveying t e wash fluid directly to the cutting polntl The pas sages 19 and 20- are connected at their upper ends with the hollow portion of the drill rod and at their lower ends with the slot openings 7- and 7x11 for the purpose of conducting the wash Huid to the reaming tools 6 and 6a. y

In drilling a hole with a rotary drill rig, water-and clay are used as 'a wash and are forced down through the hollow drill shaft ject'ed at the pointof contact between the cutting tools and the surfaces being out, the iuid will help to cut the formation and` carry the cuttings to the surface. The wash struction and reliable in its action. materials and finish of the several parts of the tool are such as experience and judgment of the manufacturer may dictate.

Various changes inform, proportions and minor details of construction may be resorted' to within the scope of the appended ga strike the walls of the hole or well at or near l meagre points greatly facilitates" and increases the cutting power. of the reamin tools by continuously removing)` the cuttings and helping to remove` the formation while the reamer is at work. 'l' l The tool is simple and substantial in @T1111- claims.' j j Having thus described our invention,

what we claim andf desire to secure by Let-l l. A rotary underreamer` "ceniprising a.` 35

hollow 'carrier or body portion, a forked mandrel slidably mounted within said carrier, a pair of reamin mounted in said mandre slots@ formed in the carrier through which the reaming tools 9c project, and means 4for automatically pr'ojecting the reaming tools int cutting position. 'i .2. A rotary underreamer comprising a,

hollow carrier or body portion, a drill collar 05 and bit secured to'same, 'a forked mandrel slidably mounted within said carrier, a pair of reamin tools pivotally mounted in said mandrel, s ots formed in the carrier throu h which the reamingA tools project, means or automatically projecting the reaming tools into cutting position, said means comprisin lever portions formed von the inner ends o the tools, and means for rocking said levers.

3. A rotary underreamer comprising a 105 hollow carrier or body portion, a drill collar and bitfsecured to same, a forked mandrel slidably mounted withinsaid carrier, a pair ofreaming tools pivotally mounted in said mandrelkslots formed inthe carrier through which the reaming tools project, means for automatically projectingthe reaming tools into'cutting position, said means comprising lever portions formed on the inner ends of the tools,l and means for rocking said levers, said means comprisln a coll spring.

so positioned as to force the orked mandrel in which the tools are mounted into its upper position which will bring thelevers into engagementwith stops and project the tools into position.

4. A rotary underreamer. comprising a hollow carrier or body portion, a hollow drill collar secured to same, a drill bit removably secured to said collar, a hollow .drill rod to which the carrier or body'is ysecured adapted to convey wash iiuid, a plurality of conduits vin the .carrier connected with the drill rod' adapted to conve fluid to the'cutting points, a forked man elslid- 130 tools pivotally. V

ably-mounted withinsaid carrier, apir of set our hands n the presence ofy two subreaming tools pivotally mounted 1n said scrlbing `Witnesses.

mandrel, slots formed in the'carrier through ALBERT J SNOW. which the reaming tools project and means ARCHIE M. KIDD. f

5 for automatically projecting tile resuming Witnesses:

tools into cutting osition. FRED P. BOLSTAD,

In testimony w ereof .we have hereunto J. 'W ALTER KEYf 

